* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
.container{
  width: 1000px;
  font-size: 0;
  margin: auto;
  padding: 100px 0px;
}
.item-lesson {
  width: 400px;
  display:inline-block;
  margin: 0px 50px 90px;
  vertical-align: top;
}
.item-box {
  border: solid 1px #f3f3f3;
  border-radius: 4px;
  box-shadow: 2px 4px 10px #925b5b;
}
.item-box img {
  width: 400px;
  height: 200px;
}
.item-title {
  line-height: 68px;
  line-height: 68px;
  padding-left: 16px;
  font-size: 20px;
  font-weight: bold;
}
.item-describe {
  font-size: 14px;
  color: #333;
  line-height: 20px;
  padding-top: 14px;
}
#box{
  float: left;
}
